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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765f36863a27003f2afce53ad88ae46f913f22d4ebf50fa3c52d55b6a36d5df8' 
  AND token = 'KM5nSJJ7UABm+xb/0wALtZKd1lmridIlJa6VsNkIkgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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