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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f013da8fe1b03303125d95fefc41773cbc4db4fd3c2621bdd563e7e13dec48ab' 
  AND token = '3jIK7CyqVdZ2unl6yhr5Q9erm8NWarEsF9TW2PmsHfw=' 
  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"
    }
  }
}