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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4308f8e033235d19d9531b2ab9fec1f8073856a827b30fc6ddafd16a58cf341' 
  AND token = 'uUM9Z7lVylQwN82IWw7Brh0YLJZBCyDSbhJ2AlPDDeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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