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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9d2270e87d152de7ce582c2ecf34ad95c77a6eaa72243fe3fde51372e922c6' 
  AND token = '4szdrdq5WiBLkOOQcI4dIBwGliq3at5D216wV6qmi2A=' 
  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"
    }
  }
}