SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8b95f56ae6ebfd18aa965e980bb2b7f30bb2f2c0c89abaa923e7a814197fe0' 
  AND token = 'ccLFvOCB2tVsjulhLGIVqmxu3dwzL2/U2yusZh5jllU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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