SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48587155ca2a127e70bba0f1cd7de6ee9f1cf36aa0a578f61504a33c0d34b92' 
  AND token = 'Q7GjFYZ7LAqCHYJBCnARWbMHskJi81Zl/nuOLqCjO+U=' 
  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"
    }
  }
}