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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0b895e5e3fd3c93130e6ce2597f41e76e075e4f61898727e7eaee9b835bcb2' 
  AND token = 'tqCTnN1Sw6tdL05kK6c73BWEJoQdFdhxE4i3n5iLcLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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