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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b58fb10bc84f0107db42e320d21658afea2a0880cb6ef6458257c8aa3517ad7' 
  AND token = 'ceLYdSyVxPd0iTTTNO/4a5m2eDG40w0M/JXs8t54LBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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