Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3804de9d1e44284160c98c60bc6979649b91dfdc2aef4f0941090079962711' 
  AND token = 'MMU/Jk0N41Az52NCQHFVyeKasvOR4VMQNkmuonilEx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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