Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a945aec7c3be8217e524b8b64cffbf722ef82ece6fb0f42f72d50e906f6a30' 
  AND token = 'ZB/SfEsPC3ZpsaIBqE+rSUJxlYFb1ECf609Y26ojWWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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