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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff8be42ca3f83161562e1bcbaed0e1fc0362bd1f772fca8eff9692ea4ca7e6f' 
  AND token = 'yUGVGM8IJXr64nEnmGr/Tv6OIdMQ7IArA+zqN03ZSAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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