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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05755ccc94de7ed5acceeccb4cb5c8bcef50996bbc524d57e9a873d5c4f12d72' 
  AND token = '9cwGwdJD2/9a8cZ5E0kMxiyyIukyTf0qIeptKVkKDAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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