Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f15bc90eedf4f707907327ec43e3bb688c1aeda1841df0756cfbf0b3aec29d' 
  AND token = '+C1QOBvkleQw8QU/L8S87HDjRknL+BCL1k7Q3naaM5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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