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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0104fae0dac875118af1863203658ba37d4cabf3a96b5efd56df82986b473c' 
  AND token = '+wzfPJGHIN72KJdL42Liu8TzRxT+NJEBE3dj+hkD5KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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