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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89a61289b45ca4db716ddb1273480ca693dd9551de27f5253431f81d8d51950' 
  AND token = 'GdO3Lm02lWBfRzUJszly8YYVLQitGFRpW7D78Z6qE1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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