SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2370368d42f9e68bfac149fe69c19ebc0df4b39abbea93685396f7e792daf99a' 
  AND token = 's4enRzHaCnZBBmC90+2jpbwi0Ud/VSYlhQqzMTHcWuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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