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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6060dbff87883355ef42eeff0f1659e555279a611033b7191875aaa8a784dc' 
  AND token = 'WTqtieJX3Ro2PpQkK6D6iKxS1Q1IDFoANadPqYVak+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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