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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fc45043c5668ef5c14e26453d8d88ec741b56de6a1bfb0cdbacbb327b4c3b3' 
  AND token = 'SFF6z/9ooE3FcdrCWjFgQtopAh5KyGbb0w4ImPY2faA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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