Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ecce888dfa42648d10af5b755f888ae49da77f41bb204b362903fcddb6e959' 
  AND token = 'An7wR8dERL9D+XSerGgsCxmhz6bjYtNA79NK2ZAAbac=' 
  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"
    }
  }
}