SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df865de519897cb8a837acf00ba9f4659c930f891c51623203b1916f193e884' 
  AND token = '0zWaYLmBhpK/6Yz5OOpYGUkeOvd0B2OdSWZTe/4JmuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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