SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22167d937538a47beb9cc7557bf63e06d3312b54cdc0bd88a3e6e8a5cb2fdb65' 
  AND token = 'qBuvZRms4W8hjE367GTYk+E8VGqTPtyNjZ7XWLZH4jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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