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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05e9757dc884b918e96458d035ec5182a9a21e1d589dc7a1d00b153cc729799' 
  AND token = 'zZmzQkzYXtdijG/q7Fdw0TH4cY7Mc5m/X1h3Bzl3cPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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