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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d7d35b8a6e626c87be94ce521505c063784031cf394e83243b269963be6e5e' 
  AND token = 'nUC2CVzMDaV3mFTd3nBywoiaOd1FTGqRjD3ehw2jApc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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