SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913e6ef88df6b7c731328a4b1b51a668792b5216d79f19b5eda84a72011c6370' 
  AND token = 'kjVYYE2G7Khv54GyHu/m4wIehsQUqB6ulA6lxTjtL/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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