SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6925cc8f3e34410f817db37237699623c50b727855c46410b01fdf9f72a15be' 
  AND token = '+Gjhvcq/2AvaURATuRkUqOkywfxqDL8l3IlFeCUHGxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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