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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092c9775a0ed9c7faa08424e0275fa340c0c2024d6ce84752867f824dd76a4d0' 
  AND token = 'nmJOb+q6GjQa3BTeyxQ6Ln5eHls8LrDK8ABRdjlwLzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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