Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4caf6b805fb214a4acf82b07b16ac319f5eeb12f821d59314d1e85709cae68' 
  AND token = '+9JMvYCqm3JuZBs6A+NKUCI3sPTRnwO7cnf4n0R8XMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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