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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8db0c1460068252947f5f38b3d782ee8e88a42e7ee8157898e332a190c68f9' 
  AND token = 'G2mC4K1tmwgL3v3gjrAcNuOtvg0Ywi9rd2D9O3xJCYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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