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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8b75e097662f535295886050de3b938e260675227661fb344d6cb0fa137713' 
  AND token = 'lOnN3hnk0DhdFkOA1hHJ94opsdPSMbuBrREzc3As8Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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