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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5f3ca3bd871260bea7e3f47f5ae771f3f6c18aa5e5a72578cc83c1bdcff207' 
  AND token = 'kXlg0u6WB2oae744xjmVijxJvLZyYDjdRnR7qYhx5QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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