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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2b77f3ae9ab3aca724ebe5c0c50a15590c28163006c45c632c73dd4bc54bb0' 
  AND token = '3qUdPdBBXKf60HbuxKoYE4PEd6SHUsmeWGzjgDfg718=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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