Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f84d5ba3d2143c45b210a1db6bdda600241db8f140bce9cf816c0f730b80f40' 
  AND token = '0Lkg/QlaO9nGFPFtGSN3sfH8Kzq6cSw49F54LiM6S1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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