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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a962e45ebd15f388e32be6c59ad792e3c6c7752ff4f2b8fde553f473cfe6d9' 
  AND token = 'Y5UxqgOlym3txAkJOsb/Tytb/+uXtFgERo96jsEP5vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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