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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d96ece60c947d8904a89d475c0fb40ed55a7be4ef339b393698f15890c7388' 
  AND token = 'FyoGj1cxyBfmCFQboLGO98H87MDuTJAwz72A7IHuJsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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