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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f39f214c16c29ba4a948c6c08bd6f9498bfb43f85a2706b74d48189ee880560' 
  AND token = 'QEw1bj7Mk25RSqZmKp8M1Ud0kW4Hr95InXYlUCaK+wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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