Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6e3258c5c8a47b5026776c7aa1082b61584768f56b719ce9a681946ef17e6d' 
  AND token = 'scOqIUlo5Q14iuiBCYSotaWSEf1TpoHg2fuZw3Zh0EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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