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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9c8e5a20c9f78ae3fd98522bb506f2c583974d7df55a60ed1ab1664970d659' 
  AND token = 'Avi6jO2OrXeqjXhcv19u8T2JbmwXCTx8Q4lCL8+hXO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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