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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba30572c36ca5a29aa1507b51616f4af4ba4fc28b5749f9365edab8e295fb7ee' 
  AND token = 'mapiyV0+DogRlHMUqWnGUDF0hx+ieB3jN43YEA4jMoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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