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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8019529975f98b20beb6db1ac7d81d477fa540de60754e43e98c8c1a3d1207d' 
  AND token = 'h+6unIVZOUbizaTX4TATiJlIgy3YDQ9lX+W9xmWMr2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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