SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cacdd0b1b57e45e2726b8a087652113e4d84bda40b8163a516a187818a62ce2c' 
  AND token = '7vLJjTJ5MZtkmqXhoVMpZgOYAPio//XKB0/UjLc/TJY=' 
  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"
    }
  }
}