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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e14e800f4c8e73600002ca5805d753c0d746b717eb03856e4ac829bb44aa5c5' 
  AND token = 'xR207l0wrhG5oDIXqUxEJbm+8CsX+h2kvwrspp6Tujc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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