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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48dd49941182b54c26cabac73761c730cd3f237e7a76a22b8ffb94a209086e92' 
  AND token = 'x8ti1TSZL4IA0cErjGZ02yVQQoAdj3kME202VjuBQTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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