Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e23f6546fbb02fe531d25f71c17cdf270e8c4fc5491405a5e96643ea56b179' 
  AND token = 'DVsStT5PAlVsKJHfVSfD5VOYHDOL5xXZehovXNVlzVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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