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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f60970f7de0308b131daa48a8006c2dbe0960a6cff663cce6cce03a365d3775' 
  AND token = 'CI3MQlko5sm7fMFHab9K+YVfhMyzuOBd4nwJmBsxRpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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