Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345277c901f08bf786e271cc88790feb2562a78a16b6cdb552e42ed57f35cf59' 
  AND token = 'xX7+4euxHPMXgp074h/SJDXUrBhoIvHUvAbPx5nF5To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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