Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97f3947028234ab2a1a7190a441fb871d4b113d380cd36bb26dfe3a71800b06' 
  AND token = 'hBr/GGHVb8ob7eX+qVbXkSVOhvMz9g5WIBs3B+Amnrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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