SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec57113a94572fe6d0a10de449481d2cc556b2da20c90b736083078a32898f76' 
  AND token = 'Ni+8QnCjKg0uTTvuzTghjBbNKoboEsYC5IxJCB1BRLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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