Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47a972cbee701766a2a74bf12221eb410c2e74458c290d95538e2145c32cb38' 
  AND token = 'OYFAc+TkeVbCQ3Q+Uvzmvf7TW5ezXqxVX7iXNl9ek50=' 
  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"
    }
  }
}