Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc8ddb2ac4eb969a6386202dc35db9b3cdaadc0412621961614acb905843a16' 
  AND token = 'WLWdQAoyVHFDvyUkaRJPkZ2s+x+afMPrf526DBQ2vY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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