SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf466d763aed3975af7f96322a3b5fed5e7e2591810f99c5491bfb3357753c6' 
  AND token = 'QMGqzQAmFvwIYSPMKJS0uL1jH4Yy+809uIEHJMNSACE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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