Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45b6c87cffdf98b4ae543ce1990253132dd9688a222acd9e89fcec1930bc53a' 
  AND token = '9lL6VDGPJ9xN+sT/4P1FFIraIvIgdI5xWv8Gi1v3avo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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