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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6148cc603ed52e182ba2a3c69e6eaf96f07e31ed557084176a7e6566516c9184' 
  AND token = '6FIA8kX8+sxVdR6u1hUgMDfRqobn+66RbkDVpf4D0zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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