SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace56569db348740468f3962572bd1923629bc69c901d81b4c9990595b683ffb' 
  AND token = 'IhXAHw/JaCglFjwYHDdgTNeFfp5b2C/JiA/9MX/uJPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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