SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddd64ad8dc11e751c9db2f8396afce96a7829603bdd9973862d6fe77cce74cf' 
  AND token = 'WIC4H10BMlRvq/YbXwc6XKjnhaTF1zhWSCnA+fYt8FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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