Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393b6de11ac494b18ff9fc91d4fcdc9191a0fd560581317a4d54d24d6adb0559' 
  AND token = 'Z+BEphCbd34GM6IuMpAAaEpsZijRm2cdTEHax+f8Agw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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