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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608ad711fb230b9873f0e807b9c0c945ec2db8e6493fc2d5a8680eb792200ed1' 
  AND token = 'Rh9MgLvEFrWBJzd++Otq9cq/SadOd5YH+s98D5VTqQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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