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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a321d6ecbd29057d2f79f55725fd4550d3f4fb6a6db5c5ae0d7e5009dc8fc99' 
  AND token = 'nm4HqNKeo0kUmva04Pw4drxTpz1FNP8qPfsAkenhKAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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