Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c209adc1e1d8b7f8a3ad7c44d3257bfec77677758dd15a71f84e12268ee4a1f' 
  AND token = 'xxlVuDvppPfkqt3/1vYwXFCqT3A4fP8Z3eLqm5MJTqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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