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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f1431228aa032abe858e3294d69df1e7ddb94d192ff14c69fe2d03486bd109' 
  AND token = 'm++mRxk7plsE9uIQroh8OL+TKDDhDXIZ9MJ+CMwY35Q=' 
  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"
    }
  }
}