Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60f7282252897f116e0fddf2d9a2a2308e3343bca9be45641bf7d30cbf93ef4' 
  AND token = 'PzTgSMmF1vtG9b829wF9ryPC2rwHSSMiSQiM3XTYX6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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