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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a174ea1bf70588a31c71ba66be09b93d07b0146cbfa25b63bbab44eb67f630' 
  AND token = '7AohqyWZuo0xr0JsqPjILC8dyFd2Wzt9xZRBuoDo4JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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