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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d27874f8c8177327120ccf0880f100a9a4eb380453a9909b3727a9c74add40' 
  AND token = 'CD4GYwtUwXAbDO6J4eYloFh/Mdk12ON3daXzGPmWNDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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