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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1683dd66898512a523764ab3de1b2a7adef7ec7805b9a42a2b876ec065f8958' 
  AND token = '+5gaAylAjHvmqCOlcFbHPmdaSePf2oA3EaSHUjyY5oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}