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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a159ecd0ebab0241af1580cc228ed3a7a87de25eb73836aeb6dd670df94351af' 
  AND token = 'ZIEv+/evdXRiB8JyBz4HzDjoG8xbrryZS63OqFwcCkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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