SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d2c46df760115a6b047bd0fe1aea0c74bc8177b8c2b93b3e89564d24769bbb' 
  AND token = 'JVzrLGrE7PHXOkBMOys/3SE34HK9UGjwqD6nYDu9wR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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